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Finding the Fourth Proportional to 5,388.78, 7,428.04 and 4,936.80

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Solution

The fourth proportional to 5,388.78, 7,428.04 and 4,936.80 is: 6,805.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,388.78 : 7,428.04 = 4,936.80 : x
  2. Step 2: Convert to fraction form
    5,388.78/7,428.04 = 4,936.80/x
  3. Step 3: Cross multiply
    5,388.78x = 7,428.04 × 4,936.80
  4. Step 4: Simplify right side
    5,388.78x = 36,670,747.87
  5. Step 5: Solve for x
    x = 36,670,747.87/5,388.78
  6. Step 6: Final answer
    x = 6,805.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.